[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 5adb3a6 [libomptarget] Fix copy-to motion for PTR_AND_OBJ entries where PTR is a struct member.
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   5adb3a6..dd32cd4  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to dd32cd4c0d66664691e5fdcd550bca0b03398d44.
CMake Error at CMakeLists.txt:3 (cmake_minimum_required):
  CMake 3.13.4 or higher is required.  You are running version 3.7.1


-- Configuring incomplete, errors occurred!